The money — including hundreds of billions in profits that U.S. companies attribute to overseas subsidiaries to avoid taxes — is supposed to be taxed at up to 35 percent when it’s brought home, or “repatriated.” Executives including John T. Chambers of Cisco Systems contend a tax break would return a flood of cash and boost the economy.

What nobody’s saying publicly is that U.S. multinationals are already finding legal ways to avoid taxes, employing strategies with nicknames worthy of 1970s conspiracy thrillers — including “the Killer B” and “the Deadly D.”